Heatcraft Condensing Unit LDV2600M6E

Preventive Maintenance Guidelines — Air-Cooled Condensing Units — Semi-Annually

Repeat all quarterly inspection items

Clean Condenser Coil and Blades

Use a brush, pressurized water, and foam coil cleaner to clean the condenser coil and blades

Ensure foam cleaner is not acid-based

Check Operation of Condenser Fans

Check that each fan rotates freely and quietly

Replace any fan motor that does not rotate smoothly or makes excessive noise

Ensure safe discharge of dry air or nitrogen holding charge

Inspect and check system pressure before charging with refrigerant

Do not open the system or remove Schrader core(s) without checking the pressure first

Avoid using ports on the filter driers for releasing the system holding charge

Ensure all service valves are open after completing piping connections

Pressurize the system to 150 psig with dry nitrogen or dry CO2

Verify system is still pressurized to 150 psig after 12 hours

Preventive Maintenance Guidelines — Air-Cooled Condensing Units — Annually

Submit an oil sample for analysis

Check for high concentrations of

Change oil and driers if test results are not normal

Investigate and describe the source of high metal concentrations

Check for possible sources of issues

Preventive Maintenance Guidelines — Air-Cooled Condensing Units — Quarterly

Check any suspect areas with an electronic leak detector.

Repair any leaks found and add refrigerant as needed.

Check condition of moisture indicator/sightglass in the sight glass if so equipped.

Replace liquid line drier if there is indication of slight presence of moisture.

Replace refrigerant, oil and drier if moisture concentration is indicated to be high.

Identify the type of head pressure control system available on the condensing unit

Dual Valve System — Operation and Adjustment

Measure the discharge pressure of the ORI valve

Adjust the ORI valve to maintain a discharge pressure of 150 PSIG for medium temperature systems

Adjust the ORI valve to maintain a discharge pressure of 100 PSIG for low temperature systems

Ensure sufficient charge to partially flood the condenser during low ambient conditions

Are gauges connected to the discharge port of the compressor for valve adjustment?

Were adjustments made during mild or low ambient conditions?